Honestly nickels and dimes, and maybe even quarters, should go too. It's ridiculous that we don't have $1 and $2 coins in widespread circulation in the US (we have a $1 coin but nobody uses it).
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> (we have a $1 coin but nobody uses it)
Because they keep designing it in the stupidest way, making it easy to confuse with a quarter. I don't know why they do that.
That said, I do prefer paper $1 bills over coins. Paper is lighter and easier to carry. But I'd only slightly grumble if we replaced it with a reasonable coin.
At least that's how it seems to me. It's an interesting design issue. I don't personally care too much -- I'm fine with the paper bill -- but I do have curiosity about why the coin designers have made the decisions they did about the $1 coin.